Yeast generates about 500 different flavors all mixing in different proportion in the beer, so yes, there can be a 'wrong kind of yeast' ifyou are aiming to make a clean tasting american lager and get a begian or german wheat style yeast. However if it tastes good when you are done, and there is no competion that this is going to, then I don't see a problem.

As to English Ale and Irish Ale... I'm not sure that there is much of a difference, but I don't know. Take a look at the manufactures description of the 2 online.